I've not done it on my boxster, but did on my 3L 924S (220 rwhp, 2506 lbs race weight). Splitter and wing cost me 4 mph top speed coming into T10a at Road Atlanta, but saved me 1.5 seconds for the overall lap.
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Tim
1998 986 (daily driver Frankencar)
1999 986 (SPB)
2001 986 S (parting)
2015 981 (sold)
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